轮机英语船舶辅助机械章节练习(2018.01.02)

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1 Moisture is removed from a refrigeration system by（）.

2 Compared to a constant pitch propeller, a controllable pitch propeller（）.

3 A knocking sound from one cylinder of an operating air compressor indicates （）.

4 The quantity of cooled air delivered by an air conditioning unit should （） the sum of the quantity of air re-circulated to the unit and the quantity mechanically exhausted.

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5 One of the main functions of wearing rings, as used in a centrifugal pump, is to （）.

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6 Which of the following pumps are self-priming, and can deal with liquid from a level below the pump? （）
(1) reciprocating
(2) rotary
(3) centrifugal

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7 Domestic water pump is started automatically by （） which operates as the water level falls to a predetermined level.

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8 Personnel working with refrigeration systems, and subject to the exposure of refrigerants should wear （）.

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9 The thermal expansion valve controls the amount of refrigerant that is allowed to flow to the （）.

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10 A vane pump belongs to （） according to its working principle.

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